Return-Path: X-Spam-DCC: paranoid 1181; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_RCVD_HELO,HTML_MESSAGE autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id tB3GYjf5008060 for ; Thu, 3 Dec 2015 17:34:45 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1a4Wmc-0006NB-4J for rs_out_1@blacksheep.org; Thu, 03 Dec 2015 16:31:02 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1a4Wmb-0006N2-Qh for rsgb_lf_group@blacksheep.org; Thu, 03 Dec 2015 16:31:01 +0000 Received: from emout03.email.it ([212.97.34.22]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1a4WlR-0004MM-CV for rsgb_lf_group@blacksheep.org; Thu, 03 Dec 2015 16:31:00 +0000 Received: from emout03.email.it (localhost [127.0.0.1]) by emout03.email.it (Postfix) with ESMTP id A82D2961FC for ; Thu, 3 Dec 2015 17:29:28 +0100 (CET) Received: from zv5000.localnet (unknown [94.36.139.122]) by emout03.email.it (Postfix) with ESMTPA id 2BCC2961F9 for ; Thu, 3 Dec 2015 17:29:27 +0100 (CET) From: Claudio Pozzi To: rsgb_lf_group@blacksheep.org Date: Thu, 03 Dec 2015 17:29:27 +0100 Message-ID: <3061063.yGTG6Xp9uk@zv5000> User-Agent: KMail/4.14.1 (Linux/3.16.0-4-686-pae; KDE/4.14.2; i686; ; ) In-Reply-To: References: <565D78F1.5060106@lineone.net> MIME-Version: 1.0 X-Scan-Signature: 4f449c45f7b1894a9195a328eedaeb30 Subject: Re: LF: Beware damage from active antennas Content-Type: multipart/alternative; boundary="nextPart80512662.i7AazRZAkN" Content-Transfer-Encoding: 7Bit X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 5524 This is a multi-part message in MIME format. --nextPart80512662.i7AazRZAkN Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" On Tuesday, December 01, 2015 11:23:09 you wrote: > Yes, there are plenty of options for normal Tx/Rx. In fact the > existing C/O relay in the 137 transmitter provides more than enough > isolation for that > > But I was on a separate active whip at the time, a quite independent > conenction and irrelevent to real operation at the time. It was the > fact that the active whip could shove out such an alarmingly high > level that concerned me - 13V very sharp spikes. And I forgot to > mention in the previous post, those 13V edge spikes went to both +13V > and -13V, so technically 26Vp-p > > Perhaps the homebrew designs others use aren't so robust in their output > stages? > For sharp spikes coming out from the cable I suggest some ferrite bead or a VK200 choke on the receiver input. I believe they have no attenuation at LF frequency. 73 de Claudio ik2pii -- Claudio Pozzi - rispondere a cla.po@tiscali.it -- ZE-Light e ZE-Pro: servizi zimbra per caselle con dominio email.it, per tutti i dettagli Clicca qui http://posta.email.it/caselle-di-posta-z-email-it/?utm_campaign=email_Zimbra_102014=main_footer/f Sponsor: Soluzioni di email hosting per tutte le esigenze: dalle caselle gratuite a quelle professionali su piattaforma Zimbra, da quelle su proprio dominio a quelle certificate PEC. Confronta le soluzioni Clicca qui: http://adv.email.it/cgi-bin/foclick.cgi?mid=13325&d=3-12 --nextPart80512662.i7AazRZAkN Content-Transfer-Encoding: 7Bit Content-Type: text/html; charset="us-ascii"

On Tuesday, December 01, 2015 11:23:09 you wrote:

> Yes, there are plenty of options for normal Tx/Rx. In fact the

> existing C/O relay in the 137 transmitter provides more than enough

> isolation for that

>

> But I was on a separate active whip at the time, a quite independent

> conenction and irrelevent to real operation at the time. It was the

> fact that the active whip could shove out such an alarmingly high

> level that concerned me - 13V very sharp spikes. And I forgot to

> mention in the previous post, those 13V edge spikes went to both +13V

> and -13V, so technically 26Vp-p

>

> Perhaps the homebrew designs others use aren't so robust in their output

> stages?

>

 

For sharp spikes coming out from the cable I suggest some ferrite bead or a VK200 choke on the receiver input. I believe they have no attenuation at LF frequency.

 

73 de Claudio ik2pii

 

--

Claudio Pozzi - rispondere a cla.po@tiscali.it

 

 




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